A thermal printer movement device

Abstract

The present invention discloses a thermal printer movement device, including a frame and a rubber roller assembly, a release plate, a print head assembly and a paper guide arranged thereon, the frame including a back plate and a support plate on one side of the back plate and a gear box on the other side, the back plate is a sheet metal bent to form a first panel and a second panel, the print head assembly is arranged on one side of the rubber roller assembly to cooperate to form a paper feeding channel, the print head assembly includes a head piece and a connected aluminum substrate; the release plate includes a release main board and a switch arm at at least one end, and more than three elastic members are arranged on the back of the aluminum substrate, wherein the outermost elastic member presses against the release main board, and the other elastic members pass through the perforations of the release main board and press against the first panel of the back plate. The present invention arranges force-applying elastic members with different functions on the print head assembly, reduces the problem of stress concentration and easy deformation of the aluminum substrate, and realizes the reset of the release plate at the same time, and has the advantages of reasonable structure, safety and reliability.

Description

Technical Field

[0001] The invention discloses a thermal printer core device, which belongs to the technical field of printer manufacturing according to the International Patent Classification (IPC). Background Art

[0002] In the existing thermal printer mechanism, the compression design of the print head assembly uses the spring and the frame mounting plate, and the release mechanism is reset by an additional torsion spring, which is complicated to install. The frame plate is made of sheet metal, and there are two main bending parts, which increases the production cost.

[0003] The cardboard in the printer is mostly limited by the paper guide protrusions, which are easy to fall off and the protrusions are easy to wear.

[0004] Chinese document CN112297645A discloses a thermal printer mechanism, including a frame, a print head assembly and a rubber roller assembly. A rotating plate is rotatably provided on the frame. The connecting portion of the rotating plate is located on one side of the print head bracket and an elastic member is provided between the rotating plate and the back of the print head bracket. All forces of the elastic members are directly transmitted from the rotating plate to the print head bracket, resulting in concentrated force in the middle of the print head bracket, which is prone to deformation. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a thermal printer core device, which acts on a trip plate and a back plate respectively through an elastic member, and the elastic member not only resets the trip plate, but also reduces the stress in the middle of the aluminum substrate.

[0006] To achieve the above object, the present invention is achieved through the following technical solutions:

[0007] A thermal printer mechanism device comprises a frame and a rubber roller assembly, a release plate, a print head assembly and a paper guide plate arranged thereon, wherein:

[0008] The frame includes a back plate, a support plate on one side of the back plate, and a gear box on the other side, wherein the back plate is formed by bending a sheet metal to form a first panel and a second panel, and an opening is formed between the first panel and the second panel;

[0009] The rubber roller assembly is rotatably arranged in the groove of the support plate of the frame and the side wall of the gear box on the other side. The rubber roller assembly is located in the opening of the back plate for easy installation and disassembly;

[0010] A print head assembly is arranged on one side of the rubber roller assembly to form a paper feeding channel. The print head assembly includes a head chip and an aluminum substrate connected thereto;

[0011] A paper guide is arranged on one side of the paper feeding passage, and a cardboard is arranged on the paper guide;

[0012] A trip plate, comprising a trip main board and a switch arm at at least one end, the switch arm being provided with a hook portion, the trip main board being arranged between the print head assembly and the first panel of the back plate, and the aluminum substrate of the print head assembly, the trip main board and the first panel of the back plate being arranged in parallel, and the trip main board being provided with at least one through hole;

[0013] The back of the aluminum substrate is provided with more than three elastic members, wherein the outermost elastic member presses against the trip main board, and the other elastic members pass through the through holes of the trip main board and press against the first panel of the back plate.

[0014] Furthermore, the elastic member between the aluminum substrate and the trip mainboard is a reset elastic member, and the elastic member between the aluminum substrate and the first panel of the back plate is a through-hole elastic member, and the elastic force of the through-hole elastic member is greater than the elastic force of the reset elastic member.

[0015] Furthermore, the cardboard includes a hook, and the paper guide is provided with one or more holes. The hook of the cardboard passes through the hole and is fixed by the second panel of the back plate.

[0016] Furthermore, an action groove is provided on the inner side of the hook of the cardboard, which cooperates with the upper side wall of the guide paperboard hole to limit the upper position of the cardboard. A limiting surface is provided on the outer side of the hook and cooperates with the second panel of the back plate to limit the lower position of the cardboard. A convex point is provided on the side of the cardboard and cooperates with the guide paperboard hole to prevent the cardboard from falling off easily before the back plate is assembled.

[0017] Furthermore, the back plate is a sheet metal part, and the first panel and the second panel of the back plate are bent at 90 degrees. Connecting parts are provided at both ends of the first panel and the second panel, and holes are provided on the connecting parts, which are respectively connected and fixed to the support plate and the side wall of the gear box by screws.

[0018] Furthermore, the thickness of the aluminum substrate is 3.8mm-4.2mm, and the thickness of the aluminum substrate is 4mm. After mechanical analysis and actual measurement, the aluminum substrate at this time not only has a good printing effect, but also reduces the plastic deformation of the aluminum substrate, which is beneficial to heat dissipation.

[0019] Furthermore, the aluminum substrate is provided with more than one rotating protrusion on the side facing the back plate, and the second panel of the back plate is provided with a mounting hole that cooperates with the rotating protrusion to form a rotating position. The aluminum substrate swings around the rotating position and provides outward force to the rubber roller assembly through the head piece.

[0020] Furthermore, guide parts are provided at both ends of the aluminum substrate, and installation grooves are provided on the support plate or the side walls of the gear box respectively. The installation groove is an L-shaped groove composed of an entry groove and a guide groove. After the guide part of the aluminum substrate enters the entry groove, it always moves in the guide groove under the action of the elastic part, and a clearance groove for the guide part to pass through is provided on the switch arm of the trip plate.

[0021] Furthermore, a pressing portion is formed at the outermost side of the switch arm at one end of the trip plate, and a rotating portion is provided on the switch arm and is installed on the support plate and the side wall of the gear box at both ends of the back plate. By applying force to the pressing portion, the trip plate is rotated around the rotating portion, compressing the reset elastic member, and the print head assembly rotates forward under the action of the elastic member and squeezes the rubber roller assembly, so that the rubber roller assembly pops out; after loading paper, the rubber roller assembly is pressed, and the rubber roller assembly enters the hook portion of the trip plate, and the trip plate is reset through the reset elastic member.

[0022] The present invention arranges force-applying elastic parts with different functions on the print head assembly, one is a through-hole elastic part, and the other is a reset elastic part. This can not only squeeze the print head assembly to always be close to the rubber roller assembly, but also reduce the problem of stress concentration and easy deformation of the aluminum substrate, and can also achieve the reset of the trip plate. It has the advantages of reasonable structure, safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a first schematic diagram of an embodiment of the present invention.

[0024] Figure 2 It is a second schematic diagram of an embodiment of the present invention.

[0025] Figure 3 It is the third schematic diagram of the embodiment of the present invention.

[0026] Figure 4 It is a cross-sectional view of an embodiment of the present invention at the position of an elastic member that does not pass through the hole.

[0027] Figure 5 It is a cross-sectional view of the through-hole elastic member of an embodiment of the present invention.

[0028] Figure 6 It is a schematic diagram of a backplane according to an embodiment of the present invention.

[0029] Figure 7 Schematic diagram of a trip plate according to an embodiment of the present invention.

[0030] Figure 8 Schematic diagram of a print head assembly according to an embodiment of the present invention.

[0031] Fig. 9 It is a schematic diagram of the cooperation between the paper guide and the cardboard in an embodiment of the present invention.

[0032] Fig.10 It is a cross-sectional view of a paper guide and a cardboard according to an embodiment of the present invention.

[0033] Fig.11 It is a side view of a cardboard according to an embodiment of the present invention.

[0034] Fig.12 It is a schematic diagram of the cooperation between the aluminum substrate and the side wall of the gear box according to an embodiment of the present invention.

[0035] Fig.13It is a schematic diagram of the structure of an embodiment of the present invention.

[0036] Fig.14 It is a cross-sectional view of an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings:

[0038] Example: See Figures 1 to 14 A thermal printer movement device includes a frame and a rubber roller assembly 1, a release plate 2, a print head assembly 3 and a paper guide 4 arranged thereon, wherein:

[0039] The frame includes a back plate 5, a support plate 6 on one side of the back plate, and a gear box 7 on the other side. The back plate 5 is formed by bending a sheet metal to form a first panel 51 and a second panel 52. An opening is formed between the first panel 51 and the second panel 52.

[0040] The rubber roller assembly 1 is rotatably arranged in the grooves of the support plate 6 of the frame and the side wall of the gear box 7 on the other side. The rubber roller assembly 1 is located in the opening of the back plate for easy installation and removal;

[0041] The print head assembly 3 is arranged on one side of the rubber roller assembly 1 to form a paper feeding channel. The print head assembly 3 includes a head chip 31 and an aluminum substrate 32 connected thereto;

[0042] A paper guide 4 is arranged at one side of the paper feeding passage, and a cardboard 8 is arranged on the paper guide 4;

[0043] The trip plate 2 includes a trip main board 21 and a switch arm 22 at at least one end, the switch arm 22 is provided with a hook portion 221, the trip main board 21 is arranged between the print head assembly 3 and the first panel 51 of the back plate, and the aluminum substrate 32 of the print head assembly, the trip main board 21 and the first panel 51 of the back plate are arranged in parallel, and the trip main board 21 is provided with at least one through hole;

[0044] The back of the aluminum substrate 32 is provided with more than three elastic members 9 , wherein the outermost elastic member 9 presses against the trip main board 21 , and the other elastic members 9 pass through the through holes of the trip main board and press against the first panel 51 of the back plate.

[0045] In one embodiment of the present invention, the elastic member between the aluminum substrate 32 and the trip main board is a reset elastic member, i.e., a non-through-hole elastic member, and the elastic member between the aluminum substrate and the first panel of the back plate is a through-hole elastic member, and the elastic force of the through-hole elastic member is greater than the elastic force of the reset elastic member. The above elastic member can be a spring or other elastic body with the same function. In the present invention, five springs are installed, such as Figure 5 ,like Figure 4 , the springs on both sides act with the trip plate, such as Figure 5 , the middle spring acts with the back plate.

[0046] In one embodiment of the present invention, Fig.10 and Fig.11 The cardboard 8 includes a hook 81, and the guide paper 4 is provided with more than one hook hole 41. A cardboard 8 is provided on each side of the guide paper 4. The hook 81 of the cardboard 8 passes through the hook hole and is limited and fixed by the second panel 52 of the back plate 5. The hook of the cardboard 8 is provided with an action groove 82 on the inner side, and the action groove 82 cooperates with the upper side wall of the guide paper hole to limit the upper position of the cardboard. The hook 81 is provided with a limiting surface 83 on the outer side and cooperates with the second panel 52 of the back plate to limit the lower position of the cardboard. The side of the cardboard 8 is provided with a convex point 84 and cooperates with the guide paper 4 hook hole so that the cardboard is not easy to fall off before the back plate 5 is assembled.

[0047] In one embodiment of the present invention, Figure 1 , 2 , 3 and Figure 6 The back plate is a sheet metal part 5, and the first panel 51 and the second panel 52 of the back plate are bent at 90 degrees. Connecting parts 501 are provided at both ends of the first panel and the second panel. Holes are provided on the connecting parts 501, which are respectively connected and fixed to the support plate 6 and the side wall of the gear box 7 by screws. The back plate 5 is provided with mounting holes to install and fix corresponding accessories, such as fixing the paper guide.

[0048] In one embodiment of the present invention, Figure 4 , 5 and Figure 8 , Fig.12 The thickness of the aluminum substrate 32 is 3.8mm-4.2mm, and the preferred thickness of the aluminum substrate is 4mm. After mechanical analysis and actual measurement, the aluminum substrate at this time not only has a good printing effect, but also reduces the plastic deformation of the aluminum substrate, which is conducive to heat dissipation. The aluminum substrate 32 is provided with more than one rotating protrusion 321 on the side facing the back plate, and the second panel 52 of the back plate is provided with a mounting hole 521 to cooperate with the rotating protrusion 321 to form a rotating position. The aluminum substrate swings around the rotating position and provides the rubber roller assembly with an outward force through the head piece. Guide parts are provided at both ends of the aluminum substrate 32, and the side walls of the support plate or the gear box 7 are respectively provided with mounting grooves 71. The mounting groove 71 is an L-shaped groove composed of an entry groove 711 and a guide groove 712. After the guide part of the aluminum substrate 32 enters the entry groove, it always moves in the guide groove 712 under the action of the elastic member 9. After the aluminum substrate enters, a stop nail 701 or a stop pin is provided at the entry groove 711 to prevent the aluminum substrate from exiting. The switch arm of the trip plate 2 is provided with a clearance groove 222 through which the guide part passes.

[0049] In one embodiment of the present invention, Figure 1 ,and Figure 7A pressing portion 223 is formed at the outermost side of the switch arm 22 at one end of the trip plate 2. A rotating portion 224 is provided on the switch arm 22 and is installed on the support plate at both ends of the back plate and the side wall of the gear box. By applying force to the pressing portion 223, the trip plate 2 rotates around the rotating portion, compressing the reset elastic member 9. The print head assembly 3 rotates forward under the action of the elastic member and squeezes the rubber roller assembly 1, so that the rubber roller assembly 1 pops out; after loading paper, the rubber roller assembly 1 is pressed, and the rubber roller assembly 1 enters the hook portion of the trip plate 2. The trip plate is reset through the reset elastic member.

[0050] like Fig.13 and Fig.14 A paper guard 102 is provided on one side of the paper guide plate. The paper guard cooperates with the paper guide plate to form an extension of the paper feeding channel. Both ends of the paper guard are connected to the shaft of the rubber roller assembly and can be removed together for paper changing.

[0051] The present invention is applicable to an eight-inch printer structure, and is generally realized by disassembling the rubber roller when loading or correcting the printing paper.

[0052] The working principle of the present invention is as follows:

[0053] 1. Power is input through the motor 101 and reduced in speed through the gear set to reach the speed required by the required rubber roller assembly.

[0054] 2. Principle of opening and closing cover: Press down the switch arm of the sheet metal release plate 2, the sheet metal release plate 2 rotates around the rotating part, indirectly compressing the springs on both sides, and squeezing the print head assembly 3 under the action of the springs, and the print head assembly will rotate forward around the lower convex point or convex part 321 and squeeze the rubber roller assembly 1, so that the rubber roller assembly pops out. After loading paper, press the rubber roller assembly, and the rubber roller assembly enters the hook part of the sheet metal release plate 2 and resets.

[0055] 3. Installation of the cardboard 8: The cardboard 8 is installed on the paper guide. The convex points on the cardboard 8 are used to limit the cardboard so that it is not easy to fall off before assembly. The sheet metal back plate and the paper guide realize the up and down and rotational limiting of the cardboard.

[0056] The beneficial effects of the present invention are as follows:

[0057] 1. Back panel: It is a sheet metal part with one major bending point. The number of bending times is reduced, which reduces production costs and facilitates the installation of paper guides. The first panel of the back panel serves to press the spring of the middle elastic part, and the second panel of the back panel is a limit cardboard.

[0058] 2. There are five springs installed, and the three in the middle are through-hole springs. The non-through-hole springs on both sides can realize the reset of the sheet metal release plate and reduce the stress in the middle of the aluminum substrate.

[0059] 3. Aluminum substrate: The thickness is 4mm. After mechanical analysis and actual measurement, the aluminum substrate at this time not only has a good printing effect, but also reduces the plastic deformation of the aluminum substrate, which is beneficial to heat dissipation.

[0060] 4. The cardboard is firmly positioned, accurately positioned, and easy to disassemble and install.

[0061] The above records are only embodiments of the present invention. Any modification or change made by a person familiar with the present technology using the present invention shall fall within the patent scope claimed by the present invention and shall not be limited to those disclosed in the embodiments.

Claims

1. A thermal printer mechanism device, comprising a frame and a rubber roller assembly, a release plate, a print head assembly and a paper guide plate arranged thereon, characterized in that: The frame includes a back plate, a support plate on one side of the back plate, and a gear box on the other side, wherein the back plate is formed by bending a sheet metal to form a first panel and a second panel, and an opening is formed between the first panel and the second panel; The rubber roller assembly is rotatably arranged in the groove of the support plate of the frame and the side wall of the gear box on the other side. The rubber roller assembly is located in the opening of the back plate for easy installation and disassembly; A print head assembly is arranged on one side of the rubber roller assembly to form a paper feeding channel. The print head assembly includes a head chip and an aluminum substrate connected thereto; A paper guide is arranged on one side of the paper feeding passage, and a cardboard is arranged on the paper guide; A trip plate, comprising a trip main board and a switch arm at at least one end, the switch arm being provided with a hook portion, the trip main board being arranged between the print head assembly and the first panel of the back plate, and the aluminum substrate of the print head assembly, the trip main board and the first panel of the back plate being arranged in parallel, and the trip main board being provided with at least one through hole; The back of the aluminum substrate is provided with more than three elastic members, wherein the outermost elastic member presses against the trip main board, and the other elastic members pass through the through holes of the trip main board and press against the first panel of the back plate; The elastic member between the aluminum substrate and the trip mainboard is a reset elastic member, and the elastic member between the aluminum substrate and the first panel of the back plate is a through-hole elastic member, and the elastic force of the through-hole elastic member is greater than the elastic force of the reset elastic member; The back panel is a sheet metal part. The first panel and the second panel of the back panel are bent at 90 degrees. Connecting parts are provided at both ends of the first panel and the second panel. The connecting parts are provided with holes, which are respectively connected and fixed to the support plate and the side wall of the gear box by screws; the thickness of the aluminum substrate is 3.8mm-4.2mm.

2. A thermal printer mechanism device according to claim 1, characterized in that: The cardboard includes a hook, and the guide paper is provided with more than one hole. The hook of the cardboard passes through the hole and is limited and fixed by the second panel of the back plate.

3. A thermal printer mechanism device according to claim 2, characterized in that: An action groove is provided on the inner side of the hook of the cardboard, and the action groove cooperates with the upper side wall of the guide paperboard hole to limit the upper position of the cardboard. A limiting surface is provided on the outer side of the hook and cooperates with the second panel of the back plate to limit the lower position of the cardboard. A convex point is provided on the side of the cardboard and cooperates with the guide paperboard hole to prevent the cardboard from falling off before the back plate is assembled.

4. A thermal printer mechanism device according to claim 1, characterized in that: The aluminum substrate is provided with one or more rotating protrusions on the side facing the back plate, and the second panel of the back plate is provided with mounting holes that cooperate with the rotating protrusions to form a rotating position. The aluminum substrate swings around the rotating position and provides outward force to the rubber roller assembly through the head piece.

5. A thermal printer mechanism device according to claim 4, characterized in that: Guide parts are provided at both ends of the aluminum substrate, and mounting grooves are provided on the support plate or the side wall of the gear box respectively. The mounting groove is an L-shaped groove composed of an entry groove and a guide groove. After the guide part of the aluminum substrate enters the entry groove, it always moves in the guide groove under the action of the elastic part, and a yield groove for the guide part to pass through is provided on the switch arm of the trip plate.

6. A thermal printer mechanism device according to any one of claims 1 to 5, characterized in that: A pressing portion is formed at the outermost side of the switch arm at one end of the trip plate. A rotating portion is provided on the switch arm and is installed on the support plate and the side wall of the gear box at both ends of the back plate. By applying force to the pressing portion, the trip plate rotates around the rotating portion, compressing the reset elastic member. Under the action of the elastic member, the print head assembly rotates forward and squeezes the rubber roller assembly, causing the rubber roller assembly to pop out. After paper is loaded, the rubber roller assembly is pressed, and the rubber roller assembly enters the hook portion of the trip plate. The trip plate is reset through the reset elastic member.

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